Mill.



PATEITIED JAN. 6, 1903. G. M. KEMP.

MILL.

APPLIUATION FILED P1113. 27, 1902.

N0 MODEL.

TH: nokms mins cu.. momumo.. WASHINGTON. u. u

UNITED STATES PATENT EEICE.

GEORGE MILLARD KEMP, OE WILLIAMSPORT, MARYLAND.

Mlm..4

SPECIFICATLON formng part 0f Letters Patent N 0. 718,003, dated January 6, 1903. x

Application led February 27,1902. Serial No. 95.391. (No model.)

To all whom, it may concern:

Be itknown that LGEORGE MILLARD KEMP, acitizen of the United States, and a resident. of Williamsport, in the county of Washington and State ofMaryland, have made certain new and useful Improvements in Mills, of which the following is a specification.

My invention is an improvement in mills, having forits objects, among others,to provide improvements in the grinding devices, in the means for feeding the material to-the grinding-surfaces, and in the meansfor controlling the grinding by regulating the discharge of the ground material from the grinding-surfaces; and the invention consists in certain novel constructions and combination of parts,

as will be hereinafterdescribed and claimed.

In the drawings, Figure l is a side eleva` tion, partly in section, ofa mill embodying my invention. Fig. 2 is a detail view illustrating the grinding-bladesin section and the main shaft in side view, such shaft being partly broken away; and Fig. 3 illustrates a somewhat different construction.

In carrying out my invention I employ a casing constructed with the cylindrical feedchamber A, to which the material is delivered at one end through the hoppemB, and the conical grinding-shell C, secured at its larger end at C to the end of the feed-chamber A and open at its smaller end at C2, which end is covered bythe controlling plate or head D,as shown in Fig.l. The inner surface of the grinding-shell C is roughened or toothed, as shown, the teeth shown in Fig. l extending parallel to each other around the inner circumference of the shell and at right angles to the axis of such shell; but manifestly the teeth of the shell may be disposed spirally, if desired, Vinstead of straight,as shown in Fig. l.

The controlling-plate D is formed to fit theouter open end of the grinding-shell and preferably slides toward and from the same 'on guides E, formed within the yoke F, the plate D having an outwardly-projecting stem D' at its center, which stem slides within a regulating sleeve or nut G, which turns in threaded bearingsfin the yoke F and can be adjusted to regulate the tension of the spring H, which bears between the said nut and the controlling-plateD and operates to press such controlling-plate yieldingly against the open end of the grinding shell or outlet of the mill, the tension of the spring controlling the resistance offered by the plate D to the discharge of the ground material, and so regulating the iineness to which the material Will be ground.

The casing is pi'ovidedwith supportinglegs I and at the end opposite the grindingshell with a bracket J, having bearings J for the shaft K, the bearings J being spaced apart to receive between them the collar K" on the shaft and by which the endwise movement of the shaft may be limited. The shaft K has a suitable pulley K2, which may receive abelt for driving the shaft.

On the shaft within the feed-chamber A, I secure the feeding-blade L, which may preferably be in the form of a spiral, as shown, and operates to force the material to the larger end of the grinding-shell C.

The grinding-blades are secured on the shaft K within the grinding-shell, are preferably spiral, as shown, and tapered' correspondingly to the conical shell C, so they gradually reduce in diameter toward the dischargeopening of the shell. These blades may be formed at their outer edges at N, as shown at Fig. 3;- but I prefer to form the outer edges of the blade with teeth, as shown in Figs. l and 2, and to provide at the outer edges of the spiral blades the rearwardly-projecting iianges N', as shown on the blades N in Fig. 2. By this fianged construction I increase the grinding-surfaces of the blades without materially increasing the weight of said blades and at the same time strengthen the blades stood from Fig. 2. As shown in Figs. l and 2, it is preferred to form the grinding-blades.

in sections, the adjoining ends of the sections being arranged to coincide to form practically a continuous spiral grinding-surface and the several sections being secured on stepped portions It, la', and 7a2 of the shaft K, square shoulders being provided at 1 at the rear ends of said steps to form stops to `prevent any rearward movement of the grinding-blades, such blades being held on their respective steps by means of keys 2, as will be understood from Fig. 2.

By the described construction it will be noticed the material supplied to the casing is fed by the blades L to the grinding devices and is then taken and fed and ground bythe spiral blades operating in connection with the grinding-shell, the material being thus ground and moved toward the discharge-opening and the latter being covered by the spring-actuated controlling-plate, whose tension may he adjusted to regulate the grinding of the material as may be desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. rlhe combination in a grinding-mill substantially as described, of the casing having a feed-chamber and at one end thereof a conical grinding-shell tapered or reduced toward its discharge end or opening and provided beyond said opening With a yoke, a controllingplate guided by said yoke, a spring for actuating said plate and means supported by the yoke for regulating the tension of said spring, the shaft extending Within the casing, a spiral feed-plate on the shaft Within the feed-chamber, and the spiral grinding-blades on the shaft Within the conical grinding-shell, substantially as set forth.

2. The combination in a grinding-mill with the casing having a discharge-opening for the grinding material of a yoke secured to the casing and having a threaded bearing for the adjusting nut or sleeve, the nut or sleeve threaded in said opening and having a central opening for the guide-rod, guides on the yoke for the controlling-plate, the controllingplate movable on said guides toward and from the discharge-opening of the casing and having a stem extending within the adjusting sleeve or nut, and the spring bearing between the controlling-plate and the sleeve or nut, substantially as and for the purposes set forth.

3. The combinationsubstantially as herein described of the conical grinding-shell toothed on its inner side and having its dischargeopening at its small end, and the grindingblades tapered on their outer edges correspondingly to the taper of the grinding-shell and provided on their outer edges With the rearwardly-projecting flanges and toothed on their outer edges, substantially as set forth.

4. In a grinding-mill the combination With the grinding-shell, of the shaft having the stepped portions of different diameters and the shoulders at the rear ends thereof, and the grinding-blade sections fitted on their respective portions of the shaft and arranged with their blades to coincide at their adjoining ends substantially as set forth.

5. A grinding-mill comprising the conical grinding-shell tapered toward its discharge end and provided with the circumferentiallyextending teeth or corrugations, the spirallydisposed grinding-blades operating in said shell and crossing the teeth thereof, and a spring-pressed controlling-plate by which t0 govern the discharge of the material from the shell, substantially as set forth.

6. The combination With the conical grinding-shell tapered or reduced toward its discharge end, of the yoke extending beyond such end of the shell and having guides for the controlling-plate and a threaded bearing for the adjusting sleeve or nut, the sleeve or nut turning in said bearing, the controllingplate having a stem guided in the adjusting sleeve or nut, the spring bearing between the sleeve or nut and the controlling-plate, and the grinding-blades operating in the shell and adapted to force the ground material toward the controlling-plate, substantially as set forth.

7. A grinding-mill comprising the horizontal shell having a tapered toothed grinding-surface, a spring-pressed controllingplate at the small discharge end of the grinding-surface and a feed-chamber at the opposite end of the tapered grinding-surface, a shaft extending through said shell, the spiral feeding-blade on the shaft in the feed-chamber, and the spiral grinding-blade on the shaft within the tapered grinding-surface and conformed thereto and toothed on its outer edge whereby it may grind against the said grindingshell surface substantially as set forth.

GEORGE MILLARD KEMP.

Witnesses:

D. C. KEMP, Roer; B'. WRIGHT. 

